25515959 has 4 divisors (see below), whose sum is σ = 29161104. Its totient is φ = 21870816.

The previous prime is 25515937. The next prime is 25515967. The reversal of 25515959 is 95951552.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25515959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25515059) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1822562 + ... + 1822575.

It is an arithmetic number, because the mean of its divisors is an integer number (7290276).

Almost surely, 2^25515959 is an apocalyptic number.

25515959 is a deficient number, since it is larger than the sum of its proper divisors (3645145).

25515959 is an equidigital number, since it uses as much as digits as its factorization.

25515959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3645144.

The product of its digits is 101250, while the sum is 41.

The square root of 25515959 is about 5051.3323984866. The cubic root of 25515959 is about 294.3996562336.

The spelling of 25515959 in words is "twenty-five million, five hundred fifteen thousand, nine hundred fifty-nine".